CROSSBITES

Question 0

describe the aetiology of anterior crossbites

Answer 0

1) mostly dentoalveolar in origin associated with class I and class III.
- crowding
- retained deciduous teeth result in abnormal eruption path
2) Some have a component of mandibular pposition
- mandible positioned forward

Question 1

a crossbite is thee result of disharmonies. what are these diisharmonies?

Answer 1

1) craniofacial skeleton
2) teeth and alveolar bone
3) neuromuscular system
- changes in mandibular posture
- dentally initiated
- muscularly determined

Question 2

Describe the clinical recognition of an anterior crossbite of skeletal origin.

Answer 2

facial:
- prominent chin, abnormal lip pattern
- large mandibular body
- under developed mid facial third
Dental:
- no forward mandibular posture
- uncrowded lower arch
- lower incisors retroclined while upper incisors proclined

Question 3

What are the reasons for treating an anterior crossbite?

Answer 3

1) Aesthetics
2) Function - prematurities which may lead to trauma along with TMJ problems
3) Periodontal considerations - labio-version of lower anteriors

Question 4

What are the possible treatment methods for an anterior crossbite?

Answer 4

1) Bite planes e.g spatula, band and welded inclined plane, acrylic inclined plane
2) Removable appliances
- anterior Z-springs
- expansion screws
- manddibular R/A with elastics to retract lower incisors
- class III activator (Frankl)